A11609 | Olympiad

The recent All-Berland Olympiad in Informatics featured $n$ participants with each scoring a certain amount of points.

As the head of the programming committee, you are to determine the set of participants to be awarded with diplomas with respect to the following criteria:

- At least one participant should get a diploma.
- None of those with score equal to zero should get awarded.
- When someone is awarded, all participants with score not less than his score should also be awarded.

Determine the number of ways to choose a subset of participants that will receive the diplomas.

The first line contains a single integer $n$ ( $1<=n<=100$ ) — the number of participants.

The next line contains a sequence of $n$ integers $a_{1},a_{2},...,a_{n}$ ( $0<=a_{i}<=600$ ) — participants' scores.

It's guaranteed that at least one participant has non-zero score.

Print a single integer — the desired number of ways.